<div class="waterfall">
  <div />
  <div />
  <div />
  <div />
  <div />
</div>

<style>
  /**
  * Waterfall
  *
  * @author jh3y
*/
  @-webkit-keyframes waterfall {
    0% {
      opacity: 0;
      -webkit-transform: translateY(-250%);
      transform: translateY(-250%);
    }
    40%,
    60% {
      opacity: 1;
      -webkit-transform: translateY(0);
      transform: translateY(0);
    }
    100% {
      opacity: 0;
      -webkit-transform: translateY(250%);
      transform: translateY(250%);
    }
  }
  @keyframes waterfall {
    0% {
      opacity: 0;
      -webkit-transform: translateY(-250%);
      transform: translateY(-250%);
    }
    40%,
    60% {
      opacity: 1;
      -webkit-transform: translateY(0);
      transform: translateY(0);
    }
    100% {
      opacity: 0;
      -webkit-transform: translateY(250%);
      transform: translateY(250%);
    }
  }

  .waterfall div {
    -webkit-animation: waterfall 1.5s infinite;
    animation: waterfall 1.5s infinite;
    background-color: #ffffff;
    height: 20px;
    left: 50%;
    margin-top: -10px;
    opacity: 0;
    position: absolute;
    top: 50%;
    width: 20px;
  }
  .waterfall div:nth-of-type(1) {
    -webkit-animation-delay: 0.25s;
    animation-delay: 0.25s;
    margin-left: -10px;
  }
  .waterfall div:nth-of-type(2) {
    -webkit-animation-delay: 0.5s;
    animation-delay: 0.5s;
    margin-left: 15px;
  }
  .waterfall div:nth-of-type(3) {
    -webkit-animation-delay: 0.75s;
    animation-delay: 0.75s;
    margin-left: -35px;
  }
  .waterfall div:nth-of-type(4) {
    -webkit-animation-delay: 1s;
    animation-delay: 1s;
    margin-left: 40px;
  }
  .waterfall div:nth-of-type(5) {
    -webkit-animation-delay: 1.25s;
    animation-delay: 1.25s;
    margin-left: -60px;
  }
</style>
